- substr: documentation ( source)
- var_dump: documentation ( source)
- str_pad: documentation ( source)
<?php
$name='abcdefOL';
$name = str_pad($name, 6, '0', STR_PAD_LEFT);
$file = substr($name, 0, strlen($name) - 3) . '/' . substr($name, -3, 3) . '/' . $name;
var_dump($file);